JPS57127365A - Facsimile system - Google Patents

Facsimile system

Info

Publication number
JPS57127365A
JPS57127365A JP56165268A JP16526881A JPS57127365A JP S57127365 A JPS57127365 A JP S57127365A JP 56165268 A JP56165268 A JP 56165268A JP 16526881 A JP16526881 A JP 16526881A JP S57127365 A JPS57127365 A JP S57127365A
Authority
JP
Japan
Prior art keywords
circuit
picture
picture signal
modem17
quantizer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56165268A
Other languages
Japanese (ja)
Inventor
Koichi Ejiri
Yoshitoshi Yamauchi
Morizumi Kurose
Akira Sakurai
Hirokawa Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP56165268A priority Critical patent/JPS57127365A/en
Publication of JPS57127365A publication Critical patent/JPS57127365A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40062—Discrimination between different image types, e.g. two-tone, continuous tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To regenerate a halftone at the output side and to record a high- quality picture, by performing the frequency compensated reply and the optimum coding according to the characteristics of an input picture after removing the texture concentration level of a picture signal which is read by scanning an original picture. CONSTITUTION:A picture signal read by the scanning of a scanner 1 of the transmitter side A is multivalue-quantized by a quantizer 3 after removing the texture concentration level through an analog compensating circuit 2. The output of the quantizer 3 is applied to a switch 6 and supplied to a logical circuit 7 after being branched into two systems. One of these two systems is applied to a MODEM17 via a editing circuit 8, a high picture element densifying and dither process circuit 10, etc. While the other system is applied to the MODEM17 via a concentration compensating circuit 12, an MTF compensating circuit 13, an editing circuit 8, etc. and then receives the frequency compensation response and the optimum coding to be transmitted to a transmission line NET. This picture signal is processed through a region discriminating circuit 20, a high picture element densifying process circuit 24, etc. of the receiver side to regenerate a halftone. Thus a high-quality picture is recorded at a block 25.
JP56165268A 1981-10-16 1981-10-16 Facsimile system Pending JPS57127365A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56165268A JPS57127365A (en) 1981-10-16 1981-10-16 Facsimile system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56165268A JPS57127365A (en) 1981-10-16 1981-10-16 Facsimile system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP8549980A Division JPS5711576A (en) 1980-06-24 1980-06-24 Facsimile system

Publications (1)

Publication Number Publication Date
JPS57127365A true JPS57127365A (en) 1982-08-07

Family

ID=15809095

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56165268A Pending JPS57127365A (en) 1981-10-16 1981-10-16 Facsimile system

Country Status (1)

Country Link
JP (1) JPS57127365A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62183265A (en) * 1986-02-07 1987-08-11 Canon Inc Image data transmission system
JPH05260306A (en) * 1991-09-13 1993-10-08 Canon Inc Image processor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62183265A (en) * 1986-02-07 1987-08-11 Canon Inc Image data transmission system
JPH05260306A (en) * 1991-09-13 1993-10-08 Canon Inc Image processor

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